Do the mains have a big bass hump, or is the sub just calibrated at a lower level than the speakers (using receiver tones, Avia, etc.)? Looks like you could turn up the sub quite a bit.
And the calibration looks pretty good. It could be flatter, if you are after that. Feel free to post your .mdat (may need to zip it to reduce the size) so I (and others) can play around with it a bit.
Here's my sub+mains, before (go by blue line, red line is without bass traps):
And after eq'ing:
